Explaination of limit switch in PA hoist

The Default PA hoist (mini electric hoist) has an upper limit switch but no down limit switch (for hoist body), no matter for fixed type or electric trolley type:

The Default electric trolley has no limit switch

BUT we can add down limit switch as follows, it is mechanical limit, and need extra cost of 12 USD.

Effect Presention (Small red circled is up limit switch, while big red circled is down limit switch)

We also have the luxury type, it is electronic limit, price is higher

The PA hoist (mini electric hoist) with wireless control, two push buttons for mini electric hoist (without electric trolley), 4 push buttons for mini electric hoist with electric trolley, we can add up and down limit switch in wireless control, that's much safer.
Default remote control for fix type (2 points +start+stop), receiver is small which is in the black junction box

Default remote control for electric trolley type (4 points +start+stop), receiver is big, pls see the black one

We also has the luxury type, price is slightly higher